source: trunk/libs/newlib/src/newlib/libc/sys/linux/net/res_data.c

/*
 * Copyright (c) 1995-1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <ctype.h>
#include <netdb.h>
#include <resolv.h>
#ifdef BIND_UPDATE
#include <res_update.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libc-symbols.h"

const char *_res_opcodes[] = {
        "QUERY",
        "IQUERY",
        "CQUERYM",
        "CQUERYU",      /* experimental */
        "NOTIFY",       /* experimental */
        "UPDATE",
        "6",
        "7",
        "8",
        "9",
        "10",
        "11",
        "12",
        "13",
        "ZONEINIT",
        "ZONEREF",
};
libresolv_hidden_data_def (_res_opcodes)

#ifdef BIND_UPDATE
const char *_res_sectioncodes[] attribute_hidden = {
        "ZONE",
        "PREREQUISITES",
        "UPDATE",
        "ADDITIONAL",
};
#endif

#ifndef __BIND_NOSTATIC
#ifdef _LIBC
/* The definition has been moved to res_libc.c.  */
#else
#undef _res
struct __res_state _res
# if defined(__BIND_RES_TEXT)
        = { RES_TIMEOUT, }      /* Motorola, et al. */
# endif
        ;
#endif

/* Proto. */
#ifndef _LIBC
int  res_ourserver_p(const res_state, const struct sockaddr_in *);
void res_pquery(const res_state, const u_char *, int, FILE *);
#endif

#ifndef _LIBC
/* Moved to res_libc.c since res_init() should go into libc.so but the
   rest of this file not.  */
int
res_init(void) {
        extern int __res_vinit(res_state, int);

        /*
         * These three fields used to be statically initialized.  This made
         * it hard to use this code in a shared library.  It is necessary,
         * now that we're doing dynamic initialization here, that we preserve
         * the old semantics: if an application modifies one of these three
         * fields of _res before res_init() is called, res_init() will not
         * alter them.  Of course, if an application is setting them to
         * _zero_ before calling res_init(), hoping to override what used
         * to be the static default, we can't detect it and unexpected results
         * will follow.  Zero for any of these fields would make no sense,
         * so one can safely assume that the applications were already getting
         * unexpected results.
         *
         * _res.options is tricky since some apps were known to diddle the bits
         * before res_init() was first called. We can't replicate that semantic
         * with dynamic initialization (they may have turned bits off that are
         * set in RES_DEFAULT).  Our solution is to declare such applications
         * "broken".  They could fool us by setting RES_INIT but none do (yet).
         */
        if (!_res.retrans)
                _res.retrans = RES_TIMEOUT;
        if (!_res.retry)
                _res.retry = 4;
        if (!(_res.options & RES_INIT))
                _res.options = RES_DEFAULT;

        /*
         * This one used to initialize implicitly to zero, so unless the app
         * has set it to something in particular, we can randomize it now.
         */
        if (!_res.id)
                _res.id = res_randomid();

        return (__res_vinit(&_res, 1));
}
#endif

void
p_query(const u_char *msg) {
        fp_query(msg, stdout);
}

void
fp_query(const u_char *msg, FILE *file) {
        fp_nquery(msg, PACKETSZ, file);
}
libresolv_hidden_def (fp_query)

void
fp_nquery(const u_char *msg, int len, FILE *file) {
        if (__res_maybe_init (&_res, 0) == -1)
                return;

        res_pquery(&_res, msg, len, file);
}
libresolv_hidden_def (fp_nquery)

int
res_mkquery(int op,                     /* opcode of query */
            const char *dname,          /* domain name */
            int class, int type,        /* class and type of query */
            const u_char *data,         /* resource record data */
            int datalen,                /* length of data */
            const u_char *newrr_in,     /* new rr for modify or append */
            u_char *buf,                /* buffer to put query */
            int buflen)                 /* size of buffer */
{
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }
        return (res_nmkquery(&_res, op, dname, class, type,
                             data, datalen,
                             newrr_in, buf, buflen));
}

#ifdef BIND_UPDATE
int
res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }

        return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
}
#endif

int
res_query(const char *name,     /* domain name */
          int class, int type,  /* class and type of query */
          u_char *answer,       /* buffer to put answer */
          int anslen)           /* size of answer buffer */
{
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }
        return (res_nquery(&_res, name, class, type, answer, anslen));
}

void
res_send_setqhook(res_send_qhook hook) {
        _res.qhook = hook;
}

void
res_send_setrhook(res_send_rhook hook) {
        _res.rhook = hook;
}

int
res_isourserver(const struct sockaddr_in *inp) {
        return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
}

int
res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
        if (__res_maybe_init (&_res, 1) == -1) {
                /* errno should have been set by res_init() in this case. */
                return (-1);
        }

        return (res_nsend(&_res, buf, buflen, ans, anssiz));
}

#ifndef _LIBC
int
res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
               u_char *ans, int anssiz)
{
        if (__res_maybe_init (&_res, 1) == -1) {
                /* errno should have been set by res_init() in this case. */
                return (-1);
        }

        return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
}
#endif

void
res_close(void) {
#ifdef _LIBC
        /*
         * Some stupid programs out there call res_close() before res_init().
         * Since _res._vcsock isn't explicitly initialized, these means that
         * we could do a close(0), which might lead to some security problems.
         * Therefore we check if res_init() was called before by looking at
         * the RES_INIT bit in _res.options.  If it hasn't been set we bail out
         * early.  */
        if ((_res.options & RES_INIT) == 0)
          return;
#endif
        res_nclose(&_res);
}

#ifdef BIND_UPDATE
int
res_update(ns_updrec *rrecp_in) {
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }

        return (res_nupdate(&_res, rrecp_in, NULL));
}
#endif

int
res_search(const char *name,    /* domain name */
           int class, int type, /* class and type of query */
           u_char *answer,      /* buffer to put answer */
           int anslen)          /* size of answer */
{
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }

        return (res_nsearch(&_res, name, class, type, answer, anslen));
}

int
res_querydomain(const char *name,
                const char *domain,
                int class, int type,    /* class and type of query */
                u_char *answer,         /* buffer to put answer */
                int anslen)             /* size of answer */
{
        if (__res_maybe_init (&_res, 1) == -1) {
                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
                return (-1);
        }

        return (res_nquerydomain(&_res, name, domain,
                                 class, type,
                                 answer, anslen));
}

const char *
hostalias(const char *name) {
        static char abuf[MAXDNAME];

        return (res_hostalias(&_res, name, abuf, sizeof abuf));
}
libresolv_hidden_def (hostalias)

#ifdef ultrix
int
local_hostname_length(const char *hostname) {
        int len_host, len_domain;

        if (!*_res.defdname)
                res_init();
        len_host = strlen(hostname);
        len_domain = strlen(_res.defdname);
        if (len_host > len_domain &&
            !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
            hostname[len_host - len_domain - 1] == '.')
                return (len_host - len_domain - 1);
        return (0);
}
#endif /*ultrix*/

#endif


#include <shlib-compat.h>

#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
# undef res_mkquery
# undef res_query
# undef res_querydomain
# undef res_search
weak_alias (__res_mkquery, res_mkquery);
weak_alias (__res_query, res_query);
weak_alias (__res_querydomain, res_querydomain);
weak_alias (__res_search, res_search);
#endif